抄録
This research aims at investigating the relation between contour_and brightness perception in the Kanizsa figure of a visual illusion. And the method of a psychophysical experiment is examined_to make the measurement highly accurate. The characteristics of brightness and contour perception of the proposed psychophysical experiment method were compared with other method, and effectiveness of the proposed method was verified. Brightness and contour perception are expressed with respect to the quantity of the stimulus called the rate of perception. As a result, it was found that the brightness perception and the contour perception never occur simultaneously, and, therefore, they would not be the reverse phenomena induced from the same cause.
